Creating Easy Blackberry Pistachio Dessert Bars is a breeze. Follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease an 8×8-inch baking dish or line it with parchment paper.
2. Mix Ingredients: In a large mixing bowl, combine the softened butter, granulated sugar, and brown sugar. Beat until creamy and well combined.
3. Add Eggs and Vanilla: Add the eggs and vanilla extract to the butter mixture. Mix until fully incorporated.
4. Combine Dry Ingredients: In a separate bowl, whisk together the flour, salt, and baking powder.
5. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined. Be careful not to overmix.
6. Add Blackberries and Pistachios: Gently fold in the fresh blackberries and chopped pistachios until evenly distributed throughout the batter.
7. Pour into Baking Dish: Spread the batter evenly into the prepared baking dish, smoothing the top with a spatula.
8. Bake: Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Remove from the oven and allow to cool in the dish for about 10 minutes. Then, transfer to a wire rack to cool completely.
10. Cut into Bars: Once cooled, cut into squares or rectangles and serve.

These simple steps will guide you in creating these delicious dessert bars effortlessly.